5-3
5.3 Troubleshooting
This section provides simple troubleshooting procedures which the user may follow to restore
normal operation.
If… Then…
there are no echoes but the scale appears
•
check if the transducer is properly connected.
there is no zero line or zero line is not in correct
position
•
check if the range shifted. (Zero line does not
appear when the range is shifted.)
•
press the [-] key so as the scale appears from
0.
you suspect low sensitivity
•
check that gain control is properly set.
the bottom is traced in zigzag pattern or you
experience occassional loss of echo
•
the sea may be rough. Bottom is traced zigzag
when the sea is rough.
•
own boat may have passed over other boat’s
wake, which blocks propagation of sound wave.
there is no depth readout
•
check to see if bottom is present on the normal
picture range.
•
check if bottom echo is strong enough (red,
reddish brown in color).
automatic shift is inoperative
•
check if bottom echo is strong enough (red,
reddish brown in color)
picture is distorted
•
check if magnetic field generating equipment
(transformer, rectifier) are nearby.
color is strange in a given area
•
check if a magnet is near the equipment.
occasional noise is seen
•
check if the cables of pulse generating
equipment are near the equipment.
there is noise and interference
•
check that GAIN and CLUTTER properly
adjusted.
•
check the setting of the noise limiter.
•
check the equipment’s ground.
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